Santello, Marco and Bianchi, Matteo and Gabiccini, Marco and Ricciardi, Emiliano and Salvietti, Gionata and Prattichizzo, Domenico and Ernst, Marc and Moscatelli, Alessandro and Jorntell, Henrik and Kappers, Astrid M L and Kyriakopoulos, Kostas and Schaeffer, Alin Abu and Castellini, Claudio and Bicchi, Antonio Towards a synergy framework across neuroscience and robotics: Lessons learned and open questions. Reply to comments on: "Hand synergies: Integration of robotics and neuroscience for understanding the control of biological and artificial hands". Physics of life reviews, 17. pp. 54-60. ISSN 1873-1457 (2016)